Commit ecd0bf33 authored by Alexandre Belloni's avatar Alexandre Belloni Committed by Stephen Boyd
Browse files

clk: at91: add at91sam9rl PMC driver 



Add a driver for the PMC clocks of the at91sam9rl SoC.

Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
[sboyd@kernel.org: Make i signed to fix signedness bug]
Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
parent 1eabdc2f

drivers/clk/at91/Makefile

+1 −1
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@@ -14,6 +14,6 @@ obj-$(CONFIG_HAVE_AT91_SMD) += clk-smd.o 
obj-$(CONFIG_HAVE_AT91_H32MX)		+= clk-h32mx.o

obj-$(CONFIG_HAVE_AT91_GENERATED_CLK)	+= clk-generated.o

obj-$(CONFIG_HAVE_AT91_I2S_MUX_CLK)	+= clk-i2s-mux.o

obj-$(CONFIG_SOC_AT91SAM9) += at91sam9260.o at91sam9x5.o

obj-$(CONFIG_SOC_AT91SAM9) += at91sam9260.o at91sam9rl.o at91sam9x5.o

obj-$(CONFIG_SOC_SAMA5D4) += sama5d4.o

obj-$(CONFIG_SOC_SAMA5D2) += sama5d2.o

drivers/clk/at91/at91sam9rl.c

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// SPDX-License-Identifier: GPL-2.0

#include <linux/clk-provider.h>

#include <linux/mfd/syscon.h>

#include <linux/slab.h>



#include <dt-bindings/clock/at91.h>



#include "pmc.h"



static const struct clk_master_characteristics sam9rl_mck_characteristics = {

	.output = { .min = 0, .max = 94000000 },

	.divisors = { 1, 2, 4, 0 },

};



static u8 sam9rl_plla_out[] = { 0, 2 };



static struct clk_range sam9rl_plla_outputs[] = {

	{ .min = 80000000, .max = 200000000 },

	{ .min = 190000000, .max = 240000000 },

};



static const struct clk_pll_characteristics sam9rl_plla_characteristics = {

	.input = { .min = 1000000, .max = 32000000 },

	.num_output = ARRAY_SIZE(sam9rl_plla_outputs),

	.output = sam9rl_plla_outputs,

	.out = sam9rl_plla_out,

};



static const struct {

	char *n;

	char *p;

	u8 id;

} at91sam9rl_systemck[] = {

	{ .n = "pck0",  .p = "prog0",    .id = 8 },

	{ .n = "pck1",  .p = "prog1",    .id = 9 },

};



static const struct {

	char *n;

	u8 id;

} at91sam9rl_periphck[] = {

	{ .n = "pioA_clk",   .id = 2, },

	{ .n = "pioB_clk",   .id = 3, },

	{ .n = "pioC_clk",   .id = 4, },

	{ .n = "pioD_clk",   .id = 5, },

	{ .n = "usart0_clk", .id = 6, },

	{ .n = "usart1_clk", .id = 7, },

	{ .n = "usart2_clk", .id = 8, },

	{ .n = "usart3_clk", .id = 9, },

	{ .n = "mci0_clk",   .id = 10, },

	{ .n = "twi0_clk",   .id = 11, },

	{ .n = "twi1_clk",   .id = 12, },

	{ .n = "spi0_clk",   .id = 13, },

	{ .n = "ssc0_clk",   .id = 14, },

	{ .n = "ssc1_clk",   .id = 15, },

	{ .n = "tc0_clk",    .id = 16, },

	{ .n = "tc1_clk",    .id = 17, },

	{ .n = "tc2_clk",    .id = 18, },

	{ .n = "pwm_clk",    .id = 19, },

	{ .n = "adc_clk",    .id = 20, },

	{ .n = "dma0_clk",   .id = 21, },

	{ .n = "udphs_clk",  .id = 22, },

	{ .n = "lcd_clk",    .id = 23, },

};



static void __init at91sam9rl_pmc_setup(struct device_node *np)

{

	const char *slck_name, *mainxtal_name;

	struct pmc_data *at91sam9rl_pmc;

	const char *parent_names[6];

	struct regmap *regmap;

	struct clk_hw *hw;

	int i;



	i = of_property_match_string(np, "clock-names", "slow_clk");

	if (i < 0)

		return;



	slck_name = of_clk_get_parent_name(np, i);



	i = of_property_match_string(np, "clock-names", "main_xtal");

	if (i < 0)

		return;

	mainxtal_name = of_clk_get_parent_name(np, i);



	regmap = syscon_node_to_regmap(np);

	if (IS_ERR(regmap))

		return;



	at91sam9rl_pmc = pmc_data_allocate(PMC_MAIN + 1,

					   nck(at91sam9rl_systemck),

					   nck(at91sam9rl_periphck), 0);

	if (!at91sam9rl_pmc)

		return;



	hw = at91_clk_register_rm9200_main(regmap, "mainck", mainxtal_name);

	if (IS_ERR(hw))

		goto err_free;



	at91sam9rl_pmc->chws[PMC_MAIN] = hw;



	hw = at91_clk_register_pll(regmap, "pllack", "mainck", 0,

				   &at91rm9200_pll_layout,

				   &sam9rl_plla_characteristics);

	if (IS_ERR(hw))

		goto err_free;



	hw = at91_clk_register_utmi(regmap, NULL, "utmick", "mainck");

	if (IS_ERR(hw))

		goto err_free;



	at91sam9rl_pmc->chws[PMC_UTMI] = hw;



	parent_names[0] = slck_name;

	parent_names[1] = "mainck";

	parent_names[2] = "pllack";

	parent_names[3] = "utmick";

	hw = at91_clk_register_master(regmap, "masterck", 4, parent_names,

				      &at91rm9200_master_layout,

				      &sam9rl_mck_characteristics);

	if (IS_ERR(hw))

		goto err_free;



	at91sam9rl_pmc->chws[PMC_MCK] = hw;



	parent_names[0] = slck_name;

	parent_names[1] = "mainck";

	parent_names[2] = "pllack";

	parent_names[3] = "utmick";

	parent_names[4] = "masterck";

	for (i = 0; i < 2; i++) {

		char name[6];



		snprintf(name, sizeof(name), "prog%d", i);



		hw = at91_clk_register_programmable(regmap, name,

						    parent_names, 5, i,

						    &at91rm9200_programmable_layout);

		if (IS_ERR(hw))

			goto err_free;

	}



	for (i = 0; i < ARRAY_SIZE(at91sam9rl_systemck); i++) {

		hw = at91_clk_register_system(regmap, at91sam9rl_systemck[i].n,

					      at91sam9rl_systemck[i].p,

					      at91sam9rl_systemck[i].id);

		if (IS_ERR(hw))

			goto err_free;



		at91sam9rl_pmc->shws[at91sam9rl_systemck[i].id] = hw;

	}



	for (i = 0; i < ARRAY_SIZE(at91sam9rl_periphck); i++) {

		hw = at91_clk_register_peripheral(regmap,

						  at91sam9rl_periphck[i].n,

						  "masterck",

						  at91sam9rl_periphck[i].id);

		if (IS_ERR(hw))

			goto err_free;



		at91sam9rl_pmc->phws[at91sam9rl_periphck[i].id] = hw;

	}



	of_clk_add_hw_provider(np, of_clk_hw_pmc_get, at91sam9rl_pmc);



	return;



err_free:

	pmc_data_free(at91sam9rl_pmc);

}

CLK_OF_DECLARE_DRIVER(at91sam9rl_pmc, "atmel,at91sam9rl-pmc", at91sam9rl_pmc_setup);